vidaXL 50762, Operating And Safety Instructions Manual, Page: 25 / 376

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disposal, during which refrigerant can possibly be released
to the surrounding space.
• Prior to work taking place, the area around the equipment
is to be surveyed to make sure that there are no flammable
hazards or ignition risks. "No Smoking" signs shall be
displayed.
• If any hot work is to be conducted on the refrigeration
equipment or any associated parts, appropriate fire
extinguishing equipment shall be available to hand. Have a
dry powder or CO2 fire extinguisher adjacent to the
charging area.
• Ensure that the area is in the open or that it is adequately
ventilated before breaking into the system or conducting
any hot work. A degree of ventilation shall continue during
the period that the work is carried out. The ventilation
should safely disperse any released refrigerant and
preferably expel it externally into the atmosphere.
7.3.4 Refrigeration equipment Checking
Where electrical components are being changed, they shall be
fit for the purpose and to the correct specification. At all times
the manufacturer's maintenance and service guidelines shall be
followed. If in doubt, consult the manufacturer's technical
department for assistance.
The following checks shall be applied to installations using
flammable refrigerants.
• The actual refrigerant charge is in accordance with the
room size within which the refrigerant containing parts are
installed.
• The ventilation machinery and outlets are operating
adequately and are not obstructed.
• If an indirect refrigerating circuit is being used, the
secondary circuit shall be checked for the presence of
refrigerant.
• Marking to the equipment continues to be visible and
legible. Markings and signs that are illegible shall be
corrected.
• Refrigeration pipe or components are installed in a position
where they are unlikely to be exposed to any substance
which may corrode refrigerant containing components,
unless the components are constructed of materials which
are inherently resistant to being corroded or are suitably
protected against being so corroded.
7.3.5 Electrical devices checking
Repair and maintenance to electrical components shall include
initial safety checks and component inspection procedures. If a
fault exists that could compromise safety, then no electrical
supply shall be connected to the circuit until it is satisfactorily
dealt with. If the fault cannot be corrected immediately but it is
necessary to continue operation, an adequate temporary
solution shall be used. This shall be reported to the owner of
the equipment so all parties are advised.
Initial safety checks shall include.
• That capacitors are discharged: this shall be done in a safe
manner to avoid possibility of sparking.
• That capacitors are discharged: this shall be done in a safe
manner to avoid possibility of sparking.
• That there is continuity of earth bonding.
7.3.6 Repairs to sealed components
During repairs to sealed components, all electrical supplies
shall be disconnected from the equipment being worked upon
prior to any removal of sealed covers, etc. If it is absolutely
necessary to have an electrical supply to equipment during
servicing, then a permanently operating form of leak detection
shall be located at the most critical point to warn of a potentially
hazardous situation.
Particular attention shall be paid to the following to ensure that
by working on electrical components, the casing is not altered
in such a way that the level of protection is affected. This shall
include damage to cables, excessive number of connections,
terminals not made to original specification, damage to seals,
incorrect fitting of glands, etc.
• Ensure that the apparatus is mounted securely.
• Ensure that seals or sealing materials have not degraded to
the point that they no longer serve the purpose of
preventing the ingress of flammable atmospheres.
Replacement parts shall be in accordance with the
manufacturer's specifications.
5
Note: The use of silicon sealant can inhibit the
effectiveness of some types of leak detection equipment.
Intrinsically safe components do not have to be isolated prior
to working on them.
7.3.7 Cabling
Check that cabling will not be subject to wear, corrosion,
excessive pressure, vibration, sharp edges or any other adverse
environmental effects. The check shall also take into account
the effects of aging or continual vibration from sources such as
compressors or fans.
7.3.8 Leak detection methods
The following leak detection methods are deemed acceptable
for all refrigerant systems.
Electronic leak detectors may be used to detect refrigerant
leaks but, in the case of flammable refrigerants, the sensitivity
may not be adequate, or may need re-calibration. (Detection
equipment shall be calibrated in a refrigerant-free area.) Ensure
that the detector is not a potential source of ignition and is
suitable for the refrigerant used.
Leak detection equipment shall be set at a percentage of the
LFL of the refrigerant and shall be calibrated to the refrigerant
employed, and the appropriate percentage of gas (25%
maximum) is confirmed.
Leak detection fluids are suitable for use with most refrigerants
but the use of detergents containing chlorine shall be avoided
as the chlorine may react with the refrigerant and corrode the
copper pipe-work.